Feet of Water to Inches of Mercury Calculator Feet of Water to Inches of Mercury Calculator Convert pressure from feet of water to inches of mercury using: \[ 1\,\text{ftH}_2\text{O} \approx 0.8818\,\text{inHg} \] * Enter the pressure in feet of water. Pressure in Feet of Water (ftH₂O): Convert to Inches of Mercury Conversion Result— inHg Reset
